I’ve been thinking about marketplaces recently in connection with newsletters. For example, CrowdMagnet is a marketplace I’ve used to find other newsletters to cross-promote with The Sample. There are also various attempts to connect newsletter authors with sponsors. (I’ve sponsored a few newsletters myself). And of course, there are plenty of other non-newsletter-related applications that exist mainly to create connections between people based on some specific kind of need (like Upwork for freelancing or Airbnb for spare rooms).
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